反键分子轨道
电子转移
光催化
工作职能
电子
吸附
电子缺陷
材料科学
解吸
光化学
化学物理
结晶学
化学
原子轨道
物理化学
纳米技术
催化作用
物理
有机化学
图层(电子)
量子力学
作者
Duoduo Gao,Wei Zhong,Xidong Zhang,Ping Wang,Huogen Yu
出处
期刊:Small
[Wiley]
日期:2023-11-10
卷期号:20 (13)
标识
DOI:10.1002/smll.202309123
摘要
The free electron transfer between cocatalyst and photocatalyst has a great effect on the bonding strength between the active site and adsorbed hydrogen atom (Hads), but there is still a lack of effective means to purposely manipulate the electron transfer in a beneficial direction of H adsorption/desorption activity. Herein, when ReSx cocatalyst is loaded on TiO2 surface, a spontaneous free-electron transfer from ReSx to TiO2 happens due to the smaller work function of ReSx, causing an over-strong S-Hads bond. To prevent the over-strong S-Hads bonds of ReSx in the ReSx/TiO2 , a free-electron reversal transfer strategy is developed to weaken the strong S-Hads bonds via increasing the work function of ReSx by incorporating O to produce ReOSx cocatalyst. Research results attest that a larger work function of ReOSx than that of TiO2 can induce reversal transfer of electrons from TiO2 to ReOSx to produce electron-rich S(2+δ)-, causing the increased antibonding-orbital occupancy of S-Hads in ReOSx/TiO2 . Accordingly, the stability of adsorbed H on S sites is availably decreased, thus weakening the S-Hads of ReOSx. In this case, an electron-rich S(2+δ)--mediated "capture-hybridization-conversion" mechanism is raised . Benefiting from such property, the resultant ReOSx/TiO2 photocatalyst exhibits a superior H2-evolution rate of 7168 µmol h-1 g-1 .
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